' Mamma Mia! ' was originally a musical by the british writer Catherine Johnson, based on the songs of Swedish group ABBA. Now this family spectacle has spawn a film version. Who is the father of Sophie (Amanda Seyfried )? Who? She want to know. After all, she is to be maried soon and someone has to lead her up the aile. On the Greek island of Kalokairi, everyone is getting excited other the preparations for the ceremony, and Sophie ' s mother (Meryl Streep ) is not ready to reveal something without breaking into song. A musical with an air of hollidays gone by.